CSE 40243 Fall 2025

CSE 40243 - Week 1 - Regular Expression Puzzles

Write a regular expression for each of these tokens:

• Any decimal integer with no leading zeroes. (except 0 alone)

• Positive decimal integer between 0 and 255.

• A C string enclosed by double quotes.

• A calendar date like 17/06/2025

• A Markdown hyperlink like [link text](http://www.nd.edu)

• A sequence of any letters a-z that does not end in ly